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4112
Service manual
Tektronix 4112 Service Manual
Computer display terminal
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Service manual
(361 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
The 4112 Computer Display Terminal
Introduction
About this Manual
Related Documents
Installation Information
General Description
Major Parts of the
Rear-Panel Controls and Connectors
Bell Indicator
Error Messages
Options
Accessories
Standard Accessories
Optional Accessories
Section 2 OPERATING INFORMATION
Controls and Indicators
Indicator Lights
Keyboard Layout
Keyboard
Samples of Hard Copy
Display Control Keys and the Thumbwheels
Rear-Panel Controls and Connectors
Operating Check
SETUP Mode
SETUP Commands
Using the Status Message
Conventions
4112 Startup
Creating a Segment
Manipulating a Graphics Segment
Graphics Input
Using GIN (Graphics Input) Mode
Characteristics
Characteristics/Specifications
Physical Characteristics
Environmental Characteristics
Physical Dimensions
Electrical Characteristics
Display Module Characteristics
Installation Requirements
Graphics Characteristics
Alphanumeric Character Sets
Theory Overview
Defining Terms
World Coordinate Space
Terminal Coordinate Space
Raster Memory Space
The Window-Viewport Transform
Window-Viewport Transform
Window
Viewport
General Display Concepts
Pixels
Characters
Bit Map and Display Concepts
4112 Alphatext Character Array
4112 Overview
Bus Masters and Slaves
Processor Bus
80-Pin Connector Signals
Display Bus
Video Controller
Vector Generator
Display Memories
Connectors
50-Pin Front-Edge Connector Signals
Processor Bus Theory
Introduction to Processor Bus
Processor Board Theory
Processor Theory Overview
Processor Board Block Diagram
Interrupt Controller
Processor Board to
System Memory
Control, Status, and Timing
Host Computer Port
Keyboard Port
Processor Board Circuit Block Descriptions
Mpu
The Bus Cycle
Memory and
Interrupt Controller
Local Data Bus Buffer
Interrupt Priority Logic and Registers
Control Logic
Read and Write Logic
Cascade Buffers and Comparator
Block Diagram
PIC Operations
The Interrupt Operating Sequence
Bus Controller Block Diagram
Bus Controller Timing
Selection Bits for ROM Banks
Processor Board Address Enabling Signals
Bus Clock Generator Timing
MPU Timing Generator Circuit
MPU State and MPU Timing Generator Signals
Keyboard Block Diagram
Ram/Rom Board Theory
General Description
General Operation
Ram/Rom Board Circuit Block Descriptions
Bus Receivers
RAM Control
Arbiter Circuitry
Timing and Control
Clock
Dynamic RAM Controller Operations
Idling
Write Cycle
Read Cycle
Refresh Cycle
Data Input Buffers
RAM Array Board
RAM Array Board Circuit Blocks
Data Output Latches
RAM Address Decode
Clock
ROM Address Decode
Data Output Drivers
RAM Controller Board Theory
General Description
General Operation
RAM Controller Boards and Memory Address Space
RAM Controller Board Circuit Block Descriptions
Bus Receivers
RAM Control
Multiplexing of RAM Addresses
Arbiter Circuitry
Timing and Control
Dynamic RAM Controller Operation
Idling
Write Cycle
Read Cycle
Refresh Cycle
Data Input Buffers
Data Output Latches
RAM Base Address Decode
Clock
Bank Address Decode
Pixel Timing Diagram
RAM Timing Generator Circuitry
Memory Cycle Priority Control Gates
Signals
Memory Control ROM Modes
Raster Memory Board Theory
Introduction
Decode and Startup Cycle
Refresh Cycle
Vector Cycles
Operate Cycle
Blockmove Source/Destination/Erase
Processor Read Cycle
Circuit Block Descriptions
Buffer
Addressable Latches
RAM Enable
RAM Control
Vector Data Input
Alus Circuit Block
Blockmove Latch
Memory Address Selectors
Memory Array
Processor Read Latches
Decode
Video Map
Dual Raster Memory Board
Display Module Theory
Introduction
Display Module Timing
Video Circuitry
Multiplier Block
Video Amplifier
Horizontal Circuitry
Horizontal Delay
Phase-Locked Loop
Horizontal Driver
Horizontal Output
Vertical Deflection Circuitry
Synchronization Delay Circuit
Vertical Ramp Generator
Vertical Linearity
Vertical Amplifier
High Voltage Supply
Error Amplifier
Triggered Variable Pulse Width Generator
Output Circuit
High Voltage Multiplier and Rectifier Circuit
Adjustment Control Keys
Recommended Test Equipment
Display Module Problems
Disk Option Troubleshooting
Disk Media Problems
Hard and Soft Errors
Disk Drive Unit Faults
Self-Test Diagnostic Program
Parts of Self-Test
Power-Up
Main Self-Test
Adjustment Routine
7X System Errors Detector
Control Flow of Self-Test
Power-Up/Self-Test Sequence
Self-Test Firmware Jump Tables
How to Run Self-Test
Self-Test Error Messages
Errors Directory
Non-Option Error Messages
Self-Test Errors Directory
Keyboard Check and Lights
Keyboard/Processor Board Errors
Processor Check
Communications and Bus Checks
RAM/ Bus and Host Port Errors
Memory Tests
ROM Check (C)
Checks
RAM Test Errors
CMOS Memory Errors
Display Bus/Board and System Errors
System Level Errors (7X)
4112 Option Tests and Error Messages
3PPI Board Tests
3Ppierrors
Disk Option Errors
Tablet Error Messages
Adjustment Self-Test
The General Menu
Adjustment Control Keys
4112 Display Adjustment Menu
Processor Board Adjustment Menu/Procedure
CMOS-Reset, Function Key F1
411 2 Display Menu
Keyboard, Function Key F2
Disk Option Adjustment Menu/Procedure
3PPI Adjustment Menu/Procedure
Tablet Adjustment Menu/Procedure
Fuse Replacement Values
Disk Drive Unit Maintenance Schedule
Signals List
Processor Board Strap Settings
Keyboard Language Option Straps
Video Controller Board Straps
External Video Straps
Strap Settings
Video Levels
Swedish Character Set
Danish/Norwegian Character Set
APL Character Set
Use of RAM at Power-Up
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•
•
•
TE
K
SERVICE MANUAL
VOLUME 1
First
Printing SEP
1982
4112
Part
No.
070-381 7-00
Product Group 16
COMPUTER DISPLAY
TERMINAL
Please Check for
CHANGE INFORMATION
at the Rear of this Manual
I.
I
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Summary of Contents for Tektronix 4112
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